Metal-etching compound



UNITED STATES PATENT OFFICE.

METAL-ETCHING COMPOUND.

Let-18.2253.

No Drawing.

To all whom it may concern:

Be it known that I, HARRY C. GLEooKLnR, a citizen of the United States, residing at Schuylkill Haven, in the county of Schuylkill and State of Pennsylvania, have invented certain new and useful Improvements in Metal-Etching Compounds, of which the following is a specification.

This invention relates to a compound for the etching of metals generally, and more particularly to the etching of steel, and has for its object to provide for a simple and inexpensive compound capable of being ex.- peditiously mixed, one ingredient thereof with the other, and applied to the article or object to be etched.

In the accomplishment of the objects and purposes of the invention, I make use of the following ingredients, and in the approximate proportions, as stated Bluestone (pulverized) 102. Salt (common) 1oz. Cider vinegar 2oz. Water 1oz.

In the use of the compound or solution thus provided, the surface of the metal to be etched is first cleaned and then coated with a suitable film of common soap, or the like. This coating or film of soap is now to he stencilled, or otherwise acted on for the outlining, in the same of the desired data, design or wording, and in a manner to expose the surface of the metal to the action of the compound or etching solution, which is to be applied to the outline in any suitable or desired manner. After the compound or solu- Specification of Letters Patent.

Application filed May 23, 1921.

Patented May 30, 1922.

Serial No. 471,938.

the several ingredients of the compound or solution may be other than as stated; that equivalents of certain of the ingredients may be substituted one for the other, as for instance, acetic acids in solution and of a corresponding strength may be used in lieu of the cider vinegar; other forms of salines in lieu of common salt; and that more or less of the water may be used or otherwise entirely eliminated, depending upon the character of the etching to be done, a strong solution being required for the production of heavy prominent etching, and a weaker solution for fine lined 'or less coarse and heavy etching.

HARRY C. GLEOCKLER. 

